/*
 * Copyright 2022 Apollo Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package com.ctrip.framework.apollo.portal.environment;

import com.ctrip.framework.apollo.portal.component.config.PortalConfig;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.Map;

/**
 * load meta server addressed from database.
 * PortalDB.ServerConfig
 */
class DatabasePortalMetaServerProvider implements PortalMetaServerProvider {
    private static final Logger logger = LoggerFactory.getLogger(DatabasePortalMetaServerProvider.class);

    /**
     * read config from database
     */
    private final PortalConfig portalConfig;

    private volatile Map<Env, String> addresses;

    DatabasePortalMetaServerProvider(final PortalConfig portalConfig) {
        this.portalConfig = portalConfig;
        reload();
    }

    @Override
    public String getMetaServerAddress(Env targetEnv) {
        return addresses.get(targetEnv);
    }

    @Override
    public boolean exists(Env targetEnv) {
        return addresses.containsKey(targetEnv);
    }

    @Override
    public void reload() {
        Map<String, String> map = portalConfig.getMetaServers();
        addresses = Env.transformToEnvMap(map);
        logger.info("Loaded meta server addresses from portal config: {}", addresses);
    }

}
